Intengu Technologies wrote: > I have seen the following posts, > http://grass.itc.it/pipermail/grassuser/2006-May/034214.html and > http://grass.itc.it/pipermail/grass-dev/2006-June/023820.html > > I have access to orthorectifed high res imagery of towns and would > like to start creating 3d models of buildings - would actually prefer > to automate this process as much as possible. > I do not have access to polygons of buildings with height.
you need to extract building footprints as 2D polygons then assign a height to each. idea: - load imagery into GRASS. - run a edge detection filter over imagery to automatically make polygons. (?? I'm unsure of which module to use, other than custom r.mfilter) - v.clean to remove small areas (false positives) - v.digit with ortho image as backdrop for more cleaning (delete non- buildings) - add a "stories" column to 2D polygon vector - give data or start as all as one column - v.extrude as in above URL. > Once models are created they will be viewed on GoogleEarth. from above URL: v.out.ogr format=KML type=face GRASS 3D vector building NVIZ screenshots: http://grass.ibiblio.org/grass61/screenshots/vector.php http://bambi.otago.ac.nz/hamish/grass/screenshots/nyc3d_nviz3_midtown.png Hamish _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
